Pitcher · 2026
Seth Halvorsen
- Age
- 26
- B/T
- R/R
- Height
- 6' 2"
- Weight
- 243 lb
- Born
- February 18, 2000 in Chicago, IL, USA
- MLB debut
- August 30, 2024
- Drafted
- 2018, round 30
- College
- Tennessee
- High school
- Heritage Christian
- dbWAR
- -.4 3 season(s)
- IP
- 19.0
- ERA
- 4.74
- FIP
- 5.72
- K/9
- 8.1
- FIP−
- 137 100 = avg
Seth Halvorsen is a relief pitcher for the Colorado Rockies. In 2026 he struck out 17 batters over 19.0 innings across 21 appearances, going 0-1. His ERA of 4.74 was 13.4% higher than the league average of 4.18. Stripping out defence, his 5.72 FIP suggests that his ERA had some help behind him. He missed bats on 23.4% of swings (10.9% of every pitch he threw), walked 15.6% of the batters he faced and struck out 17.7%. His -0.2 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.
League context
Percentile among qualified pitchers, 2026.
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 40 | 32 | 13 | 1 | 8 | 6 | .406 | .525 | .594 | .485 | 15.0% |
| vs RHB | 56 | 49 | 9 | 2 | 7 | 11 | .184 | .286 | .367 | .294 | 19.6% |
Pitch sequencing
What Seth Halvorsen throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Seth Halvorsen throws in it.
Pitch arsenal
What he throws, how hard, and how often it misses in 2026.
| Four-Seam Fastball | 235 | 98.8 | 2,290 | 40.0% | 12.7% | |
| Slider | 110 | 86.2 | 2,608 | 43.6% | 42.9% | |
| Splitter | 30 | 90.2 | 1,610 | 56.7% | 37.5% |
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 21 | 0 | 19.0 | 0 | 1 | 0 | 22 | 10 | 17 | 15 | 4.74 | 5.72 | 1.95 | 8.1 | 7.1 | 113 | 137 | -0.2 | |
| 2025 | 42 | 0 | 39.2 | 1 | 2 | 11 | 41 | 22 | 36 | 21 | 4.99 | 5.20 | 1.56 | 8.2 | 4.8 | 120 | 125 | -0.3 | |
| 2024 | 12 | 0 | 12.1 | 2 | 1 | 2 | 8 | 2 | 13 | 2 | 1.46 | 3.90 | 0.81 | 9.5 | 1.5 | 36 | 96 | 0.1 |
Head to head
Put Seth Halvorsen beside up to three others.
wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.